Intel i7 3770 vs i7 4790?

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GreyS

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Jul 13, 2014
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I don't know why,but I like more idea of having i7 3770 in my PC.

Reasons are:
1) Max temperature:
105°C vs 72°C

2) Power supply.
77W vs 84W in TDP,in real situations 62W vs 68W.

I know that 4790 has 3-8% better perfomance.. but I'm really worried about max. temp. and PS.
 
That's Tcase, not max junction temperature. The Tcase for the 3770 is actually 67.4C, and the Tjunction is 105C. The only reason you see the Tcase quoted as the "maximum operating temperature" for the 4790 is because Intel didn't openly publish Tjunction for Haswell. Websites like CPU World have no other number to use, and would rather report the wrong data instead of no data.

The processor does not just stop working at 73C. You can be sure that, just like the 3770, the allowable Tjunction (internal diode inside processor) is much higher than the Tcase.

The "official" numbers I can glean from the web is the Tjunction for Haswell dropped to 100C. I can't confirm that with a datasheet though, but it sounds about right. If it were any lower, hardcore overclockers would be screaming for Intel's head :D

That said, only hardcore overclockers need worry about Tcase and Tjunction: the worst-designed case on the planet can keep an Intel quad-core case temperature under 73C (let-alone 67C), even in the middle of the Amazon rain forest :D

And I wouldn't sweat the few watts difference in power consumption.
 
Last edited:
GreyS said:
Yeah.. but R9 280 and i7 on 450W PSU.. I'm little worried.
Click to expand...

Depends on the brand and model, really. Any decent 450w PSU and you're in the clear.


Check this out: guru3d reviewed the 280 and their power consumption with a X79 6-core setup OC'ed to 4.6ghz with power savings off and GPU @ 100% load :

System Wattage with GPU in FULL Stress = 288W
Click to expand...

Sure, that's not both CPU and GPU @ 100% load, but you can figure that your cpu will not pull over 100w.
 
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